Myrtle Beach Weather in January
January is the coldest month at Myrtle Beach, South Carolina and some nights have frost. Even so, most days warm up to a comfortable temperature.
This page gives detailed information on the typical January temperature, precipitation, sun and humidity for Myrtle Beach. The temperature and rainfall numbers here are historical averages based on climate data gathered at Grand Strand Airport. The sunshine and humidity measurements are averages from Charleston International Airport.
Temperature
| 56 °F | January average high | 13 °C |
| 37 °F | January average low | 3 °C |
January is the coldest month overall for Myrtle Beach and the 15th to 22nd are its chilliest days. They have daily highs averaging 55 degrees Fahrenheit (13 degrees Celsius) and lows of 36 °F (2 °C).
| 23 days | 50 °F max. or more (10 °C) |
| 12 days | 32 °F min. or less (0 °C) |
The temperature rises nearly every day during January to over 40 °F (4 °C) in Myrtle Beach. The city averages 13 days this month when the thermometer reaches into the 60s °F (over 16 °C). A temperature of 70 °F (21 °C) or above typically happens two days during the month.
The thermometer dips to 20 °F (-8 °C) or below on an average of 2 nights in January.
Rain
| 3.0 in | total precipitation | 76 mm |
| 10 days | of rain |
Half the time, Myrtle Beach receives 1.8 to 4.2 inches (44 to 107 mm) of rainfall in January. One in four years has drier weather, while another one in four is wetter.
Sun
| 56 % | sunshine |
| 9 days | clear skies |
The sun's rays reach the ground in Myrtle Beach during 56 percent of daylight hours on average in January, for a total of 178 hours in the month. Typically on 9 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in January at the beachside city lasts for 10 hours and 12 minutes a day on average. The shortest day of the month is the 1st with 9 hours and 58 minutes of daylight. By the end of the month, the days have lengthened to 10:33 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 70 % | January average humidity |
The relative humidity in Myrtle Beach during January usually peaks at 80 percent in the morning then drops to 54 percent by late afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm |
| Humidity % | 78 | 80 | 80 | 69 | 55 | 54 | 68 | 75 |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.